four-time cma female vocalist of the year, martina mcbride, singing one of our favorite songs. "i'm going to love you through it." >> she has sold more than 18 million albums, including six number one songs. >> and we seem to have you at least once a year telling us about a number one song on the charts again. good to see you. you're in the middle of a big tour, right? >> we are. we're on a tour that kind of wraps up this next month, then we start our christmas tour. >> this song, "i'm going to love you through" was daring. because a lot of songs speak about illness in a certain way. you flat-out said the word breast cancer, have a lot of cancer survivors in your video. >> you're in it, hoda woman. >> i came in and played with you too. what's it feel like when you're up on stage singing this song? >> that's what attracted me to the song, it's honest and real and doesn't sugar coat anything. comes from a true story. when i'm on stage, it's emotional, you know, singing somewhere the other night and all of a sudden groups of people just started standing up and holding each other.